Update README with dashboard layout examples

[rclement]

Related to discussion #141

[codecov[bot]]

Codecov Report

Merging #149 (bdd0ebe) into master (54a41a2) will not change coverage. The diff coverage is n/a.

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[rclement]

@HaveF I updated the README with more layout instructions and examples, especially the neat feature of CSS grids to specify empty spots within the grid using the . (full stop) character. Could you review everything is clearer now?

[HaveF]

Do we need to emphasize this: If a component is not in the layout configuration, it is placed at the end of the entire layout.

[rclement]

Do we need to emphasize this: If a component is not in the layout configuration, it is placed at the end of the entire layout.

Mmmh good point. An out-of-grid chart being placed in the lower right corner seems like a bug (I've seen it happen) but it should be more of a layout validation before-hand (there is none for now) issue preventing this behavior.

I've already added a warning concerning the equal number of columns, maybe adding another one that "all charts must be placed on the custom layout"?

[HaveF]

LGTM